Description of problem:
API doc for discovery_rule says both "discovery_rule[location_ids]" and "discovery_rule[organization_ids]" are optional but they seem to be required


Version-Release number of selected component (if applicable):
satellite-6.3.0-18.0.beta.el7sat.noarch


How reproducible:
always


Steps to Reproduce:
1. Have host group with ID 1 which links to default org (id 1) and default
   loc (id 2)
2. Attempt to create discovery rule and use only required fields as per
   documentation
   $ curl -k -u <user>:<pass> -X POST -H 'Accept: application/json' -H 'Content-Type: application/json' https://<fwdn>/api/v2/discovery_rules/ -d '{"discovery_rule":{"name":"MyDiscoveryRuleFromApi","search":"cpu_count=10","hostgroup_id":1}}'
{
  "error": {"id":null,"errors":{"organizations":["Host group organization Default Organization must also be associated to the discovery rule"],"locations":["Host group location Default Location must also be associated to the discovery rule"]},"full_messages":["Organizations Host group organization Default Organization must also be associated to the discovery rule","Locations Host group location Default Location must also be associated to the discovery rule"]}
}


Actual results:
Error above.


Expected results:
Either error should not be there, or documentation should say these two fields are required.


Additional info:
With both of these fields, it works
$ curl -k -u <user>:<pass> -X POST -H 'Accept: application/json' -H 'Content-Type: application/json' https://<fqdn>/api/v2/discovery_rules/ -d '{"discovery_rule":{"name":"MyDiscoveryRuleFromApi","search":"cpu_count=10","hostgroup_id":1,"organization_ids":[1],"location_ids":[2]}}'
{"id":8,"name":"MyDiscoveryRuleFromApi","search":"cpu_count=10","hostgroup_id":1,"hostname":"","max_count":0,"priority":0,"enabled":true,"created_at":"2017-09-22T14:30:13.913Z","updated_at":"2017-09-22T14:30:13.913Z"}

Reported when working on bug 1381129